Vista machine chokes network traffic and prevents XP machines from browsing internet.

> Hi all...
>
> I've had a scout around the web for the solution to this but can't
> even find any mention of it, so I thought I'd try my luck here.
>
> I have 5 pc's at home. 4 are running Windows XP and 1 is running
> Windows Vista Ultimate.
> I have disbaled IPV6 on the vista machine and have manually set the
> tcp/ip settings on all the machines so that they all sit nicely within
> the same subnet mask within the 192.168.3. ip address range. Each
> machine has it's DNS servers settings set to my ISPs dns servers, and
> the gateway set to my router's IP address (192.168.3.1)
> The router is a Draytek Vigor 2600g with the firmware 2.5.9_UK2
> installed.
>
> Until recently everything was ticking along nicely, then for some
> reason one of these pcs started to have problems connecting to the
> internet. I was completely baffled as to why because no changes had
> been made to the network settings of this machine. I wondered if there
> was a network card issue which wasn;t showing itself anywhere else, so
> decided to rebuild a test box that had Windows Server 2003 on it with
> a fresh install of Windows XP. Once the OS was installed, I installed
> Office 2003 pro, did all the updates (I had to turn off the vista
> machine to get this done!)
>
> Once all the updates were installed on the new XP machine I setup the
> email and tested browsing and everything worked fine. I turned on the
> vista machine and almost immediately the XP connection began to choke.
> I thought maybe a background process must be doind something over the
> local network, but nothing seemed to be happening.
>
> If anyone has any suggestion as to what I could try to fix this, or if
> they have had the same issues themselves and have managed to fix it,
> please plet me know.
>
> Thanks
>